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// SPDX-License-Identifier: GPL-2.0-only
/*
* Landlock LSM - Credential hooks
*
* Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net>
* Copyright © 2018-2020 ANSSI
*/
#include <linux/cred.h>
#include <linux/lsm_hooks.h>
#include "common.h"
#include "cred.h"
#include "ruleset.h"
#include "setup.h"
static int hook_cred_prepare(struct cred *const new,
const struct cred *const old, const gfp_t gfp)
{
struct landlock_ruleset *const old_dom = landlock_cred(old)->domain;
if (old_dom) {
landlock_get_ruleset(old_dom);
landlock_cred(new)->domain = old_dom;
}
return 0;
}
static void hook_cred_free(struct cred *const cred)
{
struct landlock_ruleset *const dom = landlock_cred(cred)->domain;
if (dom)
landlock_put_ruleset_deferred(dom);
}
static struct security_hook_list landlock_hooks[] __ro_after_init = {
LSM_HOOK_INIT(cred_prepare, hook_cred_prepare),
LSM_HOOK_INIT(cred_free, hook_cred_free),
};
__init void landlock_add_cred_hooks(void)
{
security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks),
&landlock_lsmid);
}
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